Steam generator



April 19, 1932. 'SCHNEmER 1,855,001

STEAM GENER-ATQR Filed Sept. 18, 1 930 Jnvenlbr: 4004! scans/Dew.

atented Apr. 19, 1932 I UNITED STATES PATENT OFFICE ADOLF scrmnrnna, or Monica, GERMANY STEAM GENERATOR Application filed September 18, 1930, Serial No. 482;?06, and in Germany December 15, 192 8.

The present invention relates to a steam sudden uneconomical temperature draps so generator installation comprising a section that regularity of operation is ensured. :xposed to radiant heat and a section to In Figs. 1 and 2 there is illustrated diavhich heat is communicated by conduction. grammatically one embodiment of the inven- Steam boiler installations of this type are tion m 1013 broadly new. The novelty of the inven- Flg. 3 1s a diagrammatic view of a boiler ;ion resides in the mode of assembling the or part of a boiler, operating in accordancelBCtlOIlS in relation to one another and to the with my invention.

;team space or spaces associated therewith Fig. 4 is a detail view showing the baflie whereby there is obtained a construction of forming a closed space within the lower maximum steaming capacity and maximum drum.

efiiciency in operation. Fig. 5 is a diagrammatic view showing an Characteristic of the invention is the feaindependentsteam space.

ture that the section or surface exposed to ra- Fig. 6 is a similar viewshowing two steam diant heat constitutes a self contained cirand water drums interconnected by tubes.

cuit shorted in the associated steam space, Fig. 7 is a detail view showing the tube exand that water that has traversed the surface tens onsheated by conduction is led to the said cira denotes the upper steam and water drum. cuit to compensate for the evaporation in I denotes the circuit exposed to radiant heat said circuit. There are thu obtain d imand short-.circuited within the drum a. The portant advantages as regards the efficiency circuit includes upcomer tubes 41 and downof the plant and also as regards the maxicomer tubes 1) connected, respectively, to the mum capacity to which the heating surfaces Steam space m and tothewater space of the may be loaded, while dry steam is supplied, drum a. e are extensions of the tubes (1 w1th Thus, the surface exposed to radiant heat 1 h r m f are baffles W1th1n the drum being caused to operate in a circuit horta II denotes the surface heated by conduccircuited in the steam space, evaporation is tl I effected at a rapid rate in the surface ex- 1 Fr h feed Water enters the drum (1 at p. posed to radiant heat while accumulation of 29 n teS the combustlon chamber.

water in the upper drum presenting the T prevent water whlch has not been heatsteam space is avoided. The circuit devised ed from passing into the circuit exposed as stated thus lends itself to the convenient t radiant heat apartltlon 0 1s p y d wlthaddition of make-up water while prevent- 1n hq D to the PI'OVISIOII 0 the ing hot water from flowing off into colden pal'tltlQn 0 Water 15 confined to follow a P r Parts f the boiler as, for example the determmed path over the surface II heated 8d 1 face heated by conduction. Thereby unecoby Conductlon, for example, downwards nomical use of the surface heated by conducthropughtubes to a i F a g tion is avoided. Further also, uneconomical the later nses general y to t 19 upper rum a .a in which it can cross over to the circuit I use of surface exposed to radmnt heat exposed to radiant heat. In the case illus- 15 avoldedby reason that thereare prpvlded at e d the front tube I! nearest to the {means 'Whlch Penmt only water. preueated bustion chamber comprised in the tubes of the m the surface heated by conquctlon to pass surface II heated by conduction are also exto the surface exposed to radiant heat. The posed to radiant heat Naturallythese P Tequlred by h secltwn tubes may be included with the tubes com- Posed to Tadlant heat, that the hottest prised in the circuitIexposed to radiantheat.

P of the boiler can be preheated on its Depending on the conditions of operation, the

way over the surface heated by conduction pdimenslons f th tub t the group of in correspondence with the temperatu e g '1- tubes d may themselves constitute a circuit dient of the furnace gases while avoiding short-circuited within the drum a, the tubes heated by conduction immediately behind the tubes cl being used as downcomers. The tubes 01" need not constitute a circuit in themselves as they receive only water from the lower drum a, that is, from a part only of the surface heated by conduction. Alternatively, the tube (1 may be supplied with water part of which has traversed the entire surface heated by conduction and part of which has traversed part only of the surface heated by conduction. Yet again, the tubes cl may be used to convey water fromv a part of the surface heated by conduction to the surface exposed to radiant heat, that is, to the tubes Z).

In the construction shown in Figs. 1 and 2 water flows through the tubes (Z in counter flow; the water may. however, flow in one direction only or may follow paths transverse to one another.

Fig. 3 shows a boiler or part of a boiler operating in accordance with the above de scription. The battle 0' in the lower drum a is so fitted as to permit the tubes 1) to opcrate" as downcomer-s for the upcomer tubes (2. If required. the battle 0 may be arranged to enclose within the lower drum a a closed space a from which mud can be withdrawn and to which are connected tubes 6 as downcomers and tubes (1 as upcomers; see, for example, Fig. 4.

In the construction according to Figs. 1 to 4 a separatesteam space is not provided for the circuit exposed to radiant heat. According to Fig. 5, however, an independent steam space m is provided, said steam space m having provision whereby water of condensation may be drawn off, for example, through tubes 11 connected to steam and water drums a located at a lower level and fitted with the downcomer tubes 6.

In the construction according to Fig. 6 two steam andwater drums a are interconnected by tubes in such wise that one drum feeds the other. This construction offers the advantage that balance of water level in the entire plantcan be ensured.

It will be seen from the drawings that the tubes cl serve to define the combustion chamber, further adding to the advantages aforesaid in respect that there is thereby obtained increased evaporation and a more rapid flow of water over the surface heated by conduction.

Fig. 7 is adetail view showing the tube extensions 6 for leading the mixture of steam and water from the tubes d into the steam space on of the upper drum a. As is Well known, high pressure drums are of very small diameter for which reason there are used extensions which are contracted so that water can pass through the gaps or intervals 25 between the said extensions.

In the drawings there is shown a lower drum a for coupling the downcomers and upcomers of the system II. With very hi steam pressures the use of such a lower drt a may be dispensed with, provided that man folds are arranged one above the other 8X1 rior to the boiler structure and connected wi the upper portion of the boiler by means downcomers and upcomers.

In a steam generator installation of t: character described and in combination, upper steam and water drum having a. fCt water inlet therein, a lower water drum, group of downcomer and upcomer tubeshea ed by conduction connecting said drums, co] nected upcomer and downcomer tubes con municating respectively with the steam spai and the water space of the upper drum an adapted to be exposed to radiant heat, bafli in the upper drum and a partition wall withi said drum between the feed Water inlet an the inlets of said last mentioned downcomei whereby the feed water first travels the tllbt heated by conduction and then travels th group of tubes exposed to radiant heat.

In witness whereof I have hereunto se my hand.

ADOLF SCHNEIDER. 

